Electromagnetic device



June 12,. 1928.-

1,673,024 R. ROYAL ELECTROMAGNETIC DEV-ICE Filed Jul 24. 1926 Awe/var I 05006 fiO Patented June 12, 1928.

UNITED STATES 1,673,024 PATENT OFFICE.

ROSCOE ROYAL, OF CHICAGO, ILLINOIS, ASSIGNOR TO WESTERN ELECTRIC COM- I'ANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

ELECTROMAGNETIC IDEVICE.

Application filed July 24, 1926. Serial No. 124,843.

This invention relates to electro-magnetic devices, and more particularly to electromagnetic relays of the type used in telephone systems.

The object of the invention is to provide a relay of simple, compact parts which may be readily and quickly assembled.

In accordance with the object, the invention contemplates the provision of an electro-magnetic structure adapted when traversed by an electric current to actuate an armature which is pivotally supported by a member which also acts as a stop to determine the distance of travel of the armature.

It is believed that the invention will be clearly understood from the following detailed description taken in connection with the accompanyin drawing, in which Fig. 1 is a si e elevation of an electromagnetic device embodying the invention;

Fig. 2 is a detail view of'the armature forming a part thereof;

Fig. 3 is a plan view of the underside of the device as viewed in Fig. 1;

Fig. 4 is an end view thereof;

Fig. 5 is an enlarged fragmentary sectional view taken substantially on line 55 of Fig. 4, and

Fig. 6 is a detail view of the combined hinge and stop member forming a. part thereof.

In the drawing, in which like numerals designate similar parts throughout the several views, the numeral 10 designates a flat core made of magnetic material such as iron, which is provided at its ends with enlarged portions .11 and 12 adjacent which are mounted insulating plates 13 and 14. A coil 15 composed of a plurality of turns of a fine insulated wire iswound upon the core 10 between the insulating plates 13 and 14 and the ends of the wire forming the coil 15 are connected to terminals 16 and 17 secured to the lower side of the enlarged end 11 in a manner hereinafter described. The enlarged end 11 is provided with offset lugs 19 and 20 in which are threaded holes to receive screws for securing the device to a mounting plate. The enlarged end 11 is provided with holes through which screws 23-23 and 24-24 are inserted for assembling the device.

On the lower side of the enlarged end 11 in addition to the terminals 16 and 17 there are mounted resilient members 26, 27, 28 and 29, nsulated from each other, from the termlnals 16 and 17 and from the enlarged end 11 by a plurality of small insulating plates 30. The assembly screws 24-24 pass through the insulating plates 30, the resilient members 26 and 27, the terminal 16, the enlarged end 11, the terminal 17 and the resilient members 28 and 29 and are threaded into a small plate 31, theplate 31 and the screws 24 cooperating to grip the above mentioned members resilient member 26 is provided at one end with a terminal portion 33 similar to the terminals 16 and 17 and at the other end is provlded with a small contact plate 35. The resilient member 27 is provided at one end with the terminal portion 34 and at the other end with a contact point 36 designed to cooperate with the contact plate 35 carried by the resilient member 26. The resilient members 26 and 27 are disposed so as to normally spring apart and maintain the contact members 35 and 36 separate.

The resilient members 28 and 29 are provlded with terminal portions 38 and 39 at one end and with contact members 40 and 41 near the other end similar to those described for the resilient members 26 and 27. The resilient member 29 is constructed at the end opposite the terminal end in the form of a U, one leg of which is adjacent the resilient member 27 and is provided with an insulating block 42 which is maintained in contact with the member 27 by the resilience of the member 29 so as to force the contact point 36 carried blyl the member 27 into engage ment with t econtact plate 35 carried by the member 26.

A bar 44 is secured to the enlarged end 11 of the core 10 by means of the assembly screws 2323.in a position substantially parallel to the core 10 and upon the end of the bar 44 adjacent the enlarged end 12 of the core 10 is mounted an armature 45 by means of a combined hinge and stop member 46. The armature 45, composed of a magnetic materiahis provided at its upper end with lugs 47-47 and atthe opposite end with an ofiset arm portion 48 upon which is mounted an insulating block 49. The combined hinge and stop member 46 comprises a bow shaped strip of a resilient non-magnetic material which is designed to arated.

be sprung over the bar 44 and the enlarged end 12 of the core 10 in the position shown in Fig. 4. One end of the member 46 is bent to partially encircle the bar 44 and this end is slotted to receive the upper end of the armature leaving prongs -50 which are bent to form circular beads which sur- 4 round the lugs 47-47 on the armature 45 and act ashinge members in which the lugs 4747 of the armature 45 may rotate. A portion is cut out of the end of the member 46 adjacent the enlarged end 12 of the core 10 through which the offset end 48 of the armature 45 is inserted, and a, partially severed portion 51 is pressed out from the member 46 to act as a stop to regulate the dis-' tance of travel of the armature 45. In its assembled position-the armature 45 18 normally restrained in contact with the stop portion 451 by the resilience of the member 28 acting against the insulating block 49 carried by the armature 45. V

In operation conductors from a controlled electric circuit may be connected to the terminals 33 and 34, conductorsfrom a controlling circuit may be connected to the terminals 16 and 17 and conductors from another controlled circuit may be connected to the terminals 38 and 39. The contact members 35 and 36 carried by the members 26 and 27 will be maintained in contact by the insulating block 42being forced against the resilient member 27 by the resilience of the member 29, and the armature 45 will be retained against the stop member 51 by the resilience of the member 28 acting against the insulating block 49 carried by the armature 45, the resilience of the member 28 also maintaining the contact members 40 and 41 carried by the members 28 and 29 sep- When it is desired to actuate the relay and effect a change in the controlled circuits.

the circuit connected to the'terminals 16 and 17 which includes a source of electrical energy is closed causing a current to flow through the coil 15, thereby magnetizing the core 10. When the magnetic force in the core 10 becomes sulhcient to overcome the resilience of the member 28, the armature 45 is drawn into contact with the enlarged end '12 of the core 10. The oflset end portion of the armature 45 then moves the re- I silient member 28 in the direction of the member 29 until the contact member 40 carried by the member 28 comes into contact with the contact plate 41, thereby closing the circuit connected to the terminals 38 and 39. The resilient member 29 is also forced aside carrying with it the U-shaped end portion, thereby releasing the pressure of the insulating block 42 carried thereby from the member 27 which allows the contact members 35 and 36 to separate due to the resilience of the member 27, and the circuit tion against the stop 51 by the resilient member 28. The circuit connected to the terminals 38 and 39 is then broken by the movement of the resilient member 28 aWay from the member 29, while the circuit connected to the terminals 33 and v34 is closed by the resilient member 29 acting 'through the insulating block 42 against the resilient member 27 to cause the contact 36 carried by the latter member to engage the contact plate carried by the member 26.

The members 26, 27, 28 and 29 may be made of any desired resiliency so that the magnetic force necessary to actuate the armature may be made large or small, while the pressed out stop member 51 may be bent with a suitable tool either toward or away from the armature 45 to vary the distance of travel of the armature. The number of turns of wire in the coil 15 may also be varied as desired to regulate the amount of magnetic force set up in the core 10.

It is to be understood, of course, that the apparatus disclosed in the above description is illustrative only and that various changes in the size "and arrangement of parts may be made Within the scope of the appended claims. The connection of the circuits as described above is only one of many combinations and various circuits may be used without departing from the scope of the invention.

What is claimed is: I i

-1. In an electro-magnetic device, an armature, means responsive to an electric current for actuating the armature, a support, and a stationary member for pivotally securing said armature to the support and having a portion to limit the movementof the armature.

2. In an electro-magnetic device, an armature provided at one end with laterally extending lugs, means responsiveto an electric current for actuating the armature, a support, and a member composed of a nonmagnetic material engaging the lugs of said armature for pivotally securing it to the support and having a portion for limiting the movement of the armature.

3. In an .electro-magnetic device, an armature provided at one end with laterally extending lugs, means responsive to an electric current for actuating the armature, a support, and an integral, non-magnetic hinge and stop member provided at one end with means for encircling the lugs on the armasupport and having a cut-out portion through which the armature is inserted, leaving a partially severed struck-out portion for limiting the movement of the armature.

4. In an elec-tro-magnetic device, an armature, means responsive to an electric current for actuating the armature, a support, a combined hinge and stop member composed of a resilient, non-magnetic material designed to be sprung over the end of the support to pivotally secure the armature to the support and to limit' the movement of the armature, and resilient means for norand means separable from said armature for pivotally securing it to the support and having a portion cooperating with the free end of the armaturefor determining its unattracted position.

In witness whereof, I hereunto subscribe my name this 10th day of July A. D., 1926.

11080011 ROYAL. 

